Crossfader settings not stored correctly

[ronso0]

Steps to reproduce:
1) reset Mixxx profile (rename/delete existing profile folder)
2) run Mixxx
3) Settings > Crossfader
4) tick "Slow fade/fast cut (additive)"
5) drag slider to the far right (fast cut)
6) close Mixxx

mixxx.cfg:
xFaderCurve 999.6

7) re-launch Mixxx
8) check crossfader settings: slider is set off one step from the far right

mixxx.cfg
xFaderCurve 90.5918

after next launch it's
xFaderCurve 47.2644 and so on

Failed to work around by adding this line to my controller script:
engine.setValue("[Mixer Profile]", "xFaderCurve", 999.6);
Putting this in init or any other manually triggered function makes no difference.

Running mixxx rev5957
Linux 3.14.23-rt20 #1 SMP PREEMPT RT x86_64

[ronso0 (ronso0)]

Okay..after some digging I managed to get that script approach working.
Key was to configure BOTH xFaderCurve and xFaderCalibration.
Maybe someone finds this helpful.
Replace 'TerminalMix' with your controllers script prefix ('ReloopBeatpad' or whatever).

First function collects and prints xFader settings to terminal.
In Preferences > Crossfader configure xFader as you like, then trigger the function via Midi.
Second function configures xFader with your desired values. This also can be fired via button or from init function of controller script like this:
TerminalMix.xFaderSetup(1);

TerminalMix.xFaderCheck = function (channel, control, value, status, group) {
    if (value) {
        var xFMode = engine.getValue("[Mixer Profile]", "xFaderMode");
        var xFCali = engine.getValue("[Mixer Profile]", "xFaderCalibration");
        var xFCurve = engine.getValue("[Mixer Profile]", "xFaderCurve");
        print ("xFMode = "+xFMode+"");
        print ("xFCali = "+xFCali+"");
        print ("xFCurve = "+xFCurve+"");
    }
}

TerminalMix.xFaderSetup = function (channel, control, value, status, group) {
    if (value) {
        /* Values set xFader to
           - additive mode
           - fast cut */
        engine.setValue("[Mixer Profile]", "xFaderMode", 0);
        engine.setValue("[Mixer Profile]", "xFaderCalibration", 0.9993068158128623);
        engine.setValue("[Mixer Profile]", "xFaderCurve", 999.6);
    }
}

This works, but settings are not reflected in the Preferences GUI.

I'm curios: where are those settings stored anyway?
mixxx.cfg only stores xFaderCurve & xFaderMode, in db I find nothing related.

[Daniel Schürmann (daschuer)]

I can confirm the issue.

The conversion is done here:
https://github.com/mixxxdj/mixxx/blob/8d191bf7ce2d62d24c6e0ffac4b2afd7359afa8a/src/preferences/dialog/dlgprefcrossfader.cpp#L203
and here:
https://github.com/mixxxdj/mixxx/blob/master/src/engine/enginexfader.cpp#L16

[Daniel Schürmann (daschuer)]

Fixed in https://github.com/mixxxdj/mixxx/commit/0f115621bc3743a68acb038105d2c3295fe93af0

[ronso0 (ronso0)]

Thank you!

[ronso0 (ronso0)]

I'm afraid this isn't fixed, yet.
The unwanted change still happens, only that now it does change much slower.
Was restarting mixxx for about 20 times while building a skin, then I went to Preferences and could drag Slider a tiny bit to the right. The graphic also changed then.

[ronso0 (ronso0)]

At least for me, this appears to be fixed (currently r6320)
xFaderCurve is not changing anymore, in mixxx.cfg it's 999.6 for about 200 restarts now.

Though, in Preferences > Crossfader, with slider set to far right, the graphic still changes (a few pixels switch from black to white) when scrolling over slider. The slider itself doesn't move.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/8684